"equation" - key terms from Wikipedia

algebraic equation
arrhenius equation
bellman equation
characteristic equation
chemical equation
continuity equation
cubic equation
difference equation
differential equation
diffusion equation
diode equation
dirac equation
drake equation
eigenvalue equation
electromagnetic wave equation
equation
equation	of motion
equation	of state
equation	of time
exposure equation
field equation
first equation
following equation
found using the following equation
functional equation
geodesic equation
goldman equation
groundwater flow equation
heat equation
human equation
lamm equation
langevin equation
laplace equation
linear equation
motion equation
nernst equation
partial differential equation
polynomial equation
quadratic equation
rate equation
regression equation
rocket equation
s equation
second equation
side of the equation
structural equation	modeling
tsiolkovsky rocket equation
van der waals equation
vorticity equation
wave equation